Question 30254
{{{ f(x) = x-2 }}}
{{{ f(-2) = -2-2 }}}
{{{ f(-2) = -4 }}}


Not sure what you meant to write for the second one...it is ambiguous. You need to use brackets to collect terms together to remove the ambiguity. I shall assume you meant:


{{{ f(x) = (1/(2x)) + 2 }}}
{{{ f(-2) = (1/(2(-2))) + 2 }}}
{{{ f(-2) = (1/(-4)) + 2 }}}
{{{ f(-2) = (-1/4) + 2 }}}
{{{ f(-2) = (-1/4) + 8/4 }}}
{{{ f(-2) = 7/4 }}}


If you meant to write {{{ f(x) = 1/(2x+2) }}} then learn to use brackets more in your maths language and now you can do this one :-)... the answer is -1/2.


jon